For commercialization of proton exchange membrane fuel cells (PEMFCs), the loading amount of Pt-based cathode catalysts for oxygen reduction reaction (ORR) needs be significantly reduced. In this study, we propose Pt catalysts supported by an iron/nitrogen-doped porous carbon (FeNC) nanostructure having a catalytic activity for ORR in order to significantly reduce the utilization of Pt. The FeNC nanostructure was prepared using a template method with 50 and 500 nm SiO₂ beads and phthalocyanine as a dopant and carbon source. The nanosized Pt catalysts with different loading weights (5, 10, 20, 30 wt%) were uniformly deposited on the FeNC with a bimodal porous crystalline doped carbon nanostructure using an electron beam radiation method. In particular, the cathode catalyst having 5 wt% Pt on FeNC (Pt5/FeNC) exhibited enhanced ORR mass activities of 2.19 and 2.58 A mg_Pt⁻¹ at 0.9 V measured by electrochemical half cells in acidic and alkaline media, respectively, compared to a commercial Pt(20 wt%)/C (Pt20/C). Furthermore, Pt5/FeNC showed a higher mass activity of 18.76 A mg_Pt⁻¹ at 0.6 V as a unit cell performance than that of the commercial catalyst. The improved ORR activity of Pt/FeNC might be synergistically attributed to the homogeneous dispersion of Pt nanoparticles on the bimodal porous doped carbon nanostructure, the interaction (electronic effect) between the metallic catalyst and the doped support, and the dual catalytic effect of both Pt and the doped carbon nanostructure.

为了使质子交换膜燃料电池（PEMFC）商业化，需要显着减少用于氧还原反应（ORR）的基于Pt的阴极催化剂的负载量。在这项研究中，我们提出了一种由铁/氮掺杂的多孔碳（FeNC）纳米结构支撑的Pt催化剂，该纳米结构对ORR具有催化活性，以便显着降低Pt的利用率。FeNC纳米结构是使用模板法使用50和500 nm SiO ₂制备的珠和酞菁作为掺杂剂和碳源。使用电子束辐射方法，将具有不同负载量（5、10、20、30 wt％）的纳米级Pt催化剂均匀地沉积在具有双峰多孔晶体掺杂碳纳米结构的FeNC上。特别地，与酸性和碱性介质中的电化学半电池相比，在FeNC上具有5 wt％Pt的阴极催化剂（Pt5 / FeNC）在0.9 V电压下分别显示出2.19和2.58 A mg _Pt ^-1的增强的ORR质量活性。商业Pt（20 wt％）/ C（Pt20 / C）。此外，Pt5 / FeNC显示更高的质量活度，为18.76 A mg _Pt ^-1在0.6 V下的单位电池性能要比市售催化剂高。Pt / FeNC的ORR活性的提高可能归因于Pt纳米颗粒在双峰多孔掺杂碳纳米结构上的均匀分散，金属催化剂与掺杂载体之间的相互作用（电子效应）以及Pt两者的双重催化作用和掺杂的碳纳米结构。